Corrosion behavior of AZ91 Mg alloy with a heterogeneous structure produced by ECAP
The microstructure of a commercial AZ91 Mg alloy was modified via equal channel angular
pressing (ECAP) and subsequent aging. Immersion corrosion testing in 3.5 wt.% NaCl
solution indicated that the ECAP alloy with heterogeneous grain structure had the best
corrosion performance, which mainly stemmed from that the galvanic effect was weakened
due to the reduced fraction and modified distribution of β phase particles. An aging treatment
consisting of 60–90 h at 150℃ produced fine β phase precipitates which enhanced the …
pressing (ECAP) and subsequent aging. Immersion corrosion testing in 3.5 wt.% NaCl
solution indicated that the ECAP alloy with heterogeneous grain structure had the best
corrosion performance, which mainly stemmed from that the galvanic effect was weakened
due to the reduced fraction and modified distribution of β phase particles. An aging treatment
consisting of 60–90 h at 150℃ produced fine β phase precipitates which enhanced the …
Abstract
The microstructure of a commercial AZ91 Mg alloy was modified via equal channel angular pressing (ECAP) and subsequent aging. Immersion corrosion testing in 3.5 wt.% NaCl solution indicated that the ECAP alloy with heterogeneous grain structure had the best corrosion performance, which mainly stemmed from that the galvanic effect was weakened due to the reduced fraction and modified distribution of β phase particles. An aging treatment consisting of 60–90 h at 150 ℃ produced fine β phase precipitates which enhanced the micro-galvanic effect, such that the corrosion rates increased but were still lower than that of the as-cast alloy.
Elsevier
